Improvement in vulcanizing rubber belting



J. MAYALL.

T. Vulcanizing Rubber Be|ting,. sc.v

Patented JJ!` 1, 1873.

Inventor.'

Mn/ses:

UNITED STATES PATENT Orrron THOMAS J. MAYALL, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN VULCANlZlNG RUBBER BEETING, &c.

Specification forming part of Letters Patent No. 140,519, dated July 1,1873; application filed June 21, 1873.

To all whom 'it may concern:

Be it known that I, THOMAS J. MAYALL, of Boston, Suffolk county,Massachusetts, have invented certain new and useful Improvements inPresses for Vulcanizing India-Rubber Belting, Hose, Packing, and otherarticles, of which the following is a specification:

This invention consists in combining with the steam plates or jackets ofa vulcanizing or curing press removable molds so coustructed as to bereadily att-ached to and detached from the said plates or jackets. Thetop portions or followers of the molds are attached to thevertically-movable top plate of the press, and the bottom portions ofthe molds or molds proper are attached to the under stationary plate ofthe press. The two portions of each mold will be brought together orseparated, according as the top plate is moved down or up, and they canbe accurately adjusted so that the one will fit on orV into the other.

It has been usual heretofore to employ molds which were separate fromthe press or its plates or jackets; butin this case the .molds have beenlaid loosely on the bed or lower plate of the press, and the followershave been laid loosely on top of the material in the molds. The topplate of the press when lowered would press down the followers on orinto the molds, this pressure with accompanying heat being continueduntil vulcanization of the articles in the molds. In order to get at thegoods in the molds after vulcanization, it has been necessary to firstraise the top plate of the pressL and then remove the followers by hand,which consumes much time and involves considerable trouble and labor.

My invention obviates all these difficulties and objections. Thefollowers are lifted by the top plate, and when once adjusted to theirmolds require no further looking` after. At

the same time, as both molds and followers are readily detached, theycan be removed and replaced bylarger or smaller molds and followers.

The manner in which my invention is or may be carried into effect isrepresented in the accompanying drawing, in which- Figure l is a sideelevation of so much of a vulcanizing-press as is needed to illustratemy ated by suitable gearing, which revolves screwspindles a having theirbearing in the frame of the press, and engaging internally-screwthreadedsockets b on the upper plate. The lower plate or bed B is stationary.The molds represented in the drawings in illustration of my inventionare for curing belting. They are shown at O, and rest on the lowerplates B, to which they are secured in any suitable manner, and bysuitable means which will permit them to be removed when desired. Themeans shown in the drawing consist of vertical ears c extending beyondand down along the plate B at each end thereof, through which pass setor binding screws d, catching under a ledge or flange, e, or itsequivalent, formed on or attached to each end of plate B. The molds canA thus be firmly held in position. They can be easily adjusted indifferent positions on the bed, as, their screws when loosened will,when the molds are moved on the bed, slide along` under the flange e.They can also be readily removed by withdrawing the screws fromengagement with the flanges c. The mold-followers are shown at D, andare attached to the upper plate A in precisely the same manner as thatin which the molds are attached to the lowerplate, c being the ears ofthe followers, d their binding-screws, and e thc ledges or flanges onthe upper plate.

The remarks above made as to the attachment of the molds to their plateand the mode of manipulating them apply with equal force to theattachment and manipulation of the follower.

It will be understood that the shapes of the molds will vary accordingto the kind of article to be vulcanized, whether belting, hose,

packing", rubber strips for billiard-cushions, Ste. The mode ofapplying1 the two parts of the molding apparatus will, however, beessentially the same in all cases.

Having now described my invention, and the manner in which the same :isor may be carried into effect, what I claim, and desire to secure byLetters Patent, is

l. In a vulcanizing-press, the combination, with the top and bottomheating jackets or plates, of removable and adjustable top and bottommold-plates, or molds proper, and followers, attached, respectively, tothe said top and bottom jackets, substantially as and for the purposesdescribed.

JOHN BULKLEY, EDM. F. BROWN.

